There are users calling unregister_shrinker() when register_shrinker()
failed. Add sanity check to unregister_shrinker().
Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index c02c850..9e100cc 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -297,6 +297,8 @@ int register_shrinker(struct shrinker *shrinker)
*/
void unregister_shrinker(struct shrinker *shrinker)
{
+ if (!shrinker->nr_deferred)
+ return;
down_write(&shrinker_rwsem);
list_del(&shrinker->list);
up_write(&shrinker_rwsem);
--
1.8.3.1
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